How much of 10% hcl and 35% hcl would be needed to mix and produce 60 liters of 25% hcl?
about 30 & 30 liters
about 33 & 27 liters
about 36 & 24 liters
about 39 & 21 liters

about 36 and 24 liters  

Step-by-step explanation:

    a+b = 60     1

let A multiplied by  10 percent and B multiplied by 35 percent then

  10 a + 35 b = 1500 ( 60 * 25 ) 2

add no. 1 to 2 and multiply no.1  by -10

-10 a+ -10 b = -600

10 a+ 35 b = 1500  adding

then     25 b = 900 then         b = 36 liter

then     a = 24 liter    

a² + b²= c²

24² + 7² = c²

c= 25